chore : update devfile with ephemeral graphroot directory

Signed-off-by: Rohan Kumar <rohaan@redhat.com>

Author: rohanKanojia

.devfile.yaml

@@ -10,6 +10,12 @@ components:
       image: quay.io/devfile/universal-developer-image:ubi9-latest
       memoryLimit: 6Gi
       memoryRequest: 256Mi
+      volumeMounts:
+        - name: graphroot
+          path: /home/user/.local/share/containers/storage
+  - name: graphroot
+    volume:
+      ephemeral: true
 commands:
   - id: build-and-push-base-image
     exec: